netdev - [PATCH net-next 09/12] net: mtk_eth_soc: move MAC_MCR setting to mac

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Date:   Wed, 18 May 2022 15:55:12 +0100
From:   "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Marek Behún <kabel@...nel.org>,
        Felix Fietkau <nbd@....name>, John Crispin <john@...ozen.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        netdev@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 09/12] net: mtk_eth_soc: move MAC_MCR setting to
 mac_finish()

Move the setting of the MTK_MAC_MCR register from the end of mac_config
into the phylink mac_finish() method, to keep it as the very last write
that is done during configuration.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 33 ++++++++++++++-------
 1 file changed, 22 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 211457a8831d..d9947faa2cd3 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -269,8 +269,8 @@ static void mtk_mac_config(struct phylink_config *config, unsigned int mode,
 	struct mtk_mac *mac = container_of(config, struct mtk_mac,
 					   phylink_config);
 	struct mtk_eth *eth = mac->hw;
-	u32 mcr_cur, mcr_new, sid, i;
 	int val, ge_mode, err = 0;
+	u32 sid, i;
 
 	/* MT76x8 has no hardware settings between for the MAC */
 	if (!MTK_HAS_CAPS(eth->soc->caps, MTK_SOC_MT7628) &&
@@ -408,16 +408,6 @@ static void mtk_mac_config(struct phylink_config *config, unsigned int mode,
 		return;
 	}
 
-	/* Setup gmac */
-	mcr_cur = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id));
-	mcr_new = mcr_cur;
-	mcr_new |= MAC_MCR_IPG_CFG | MAC_MCR_FORCE_MODE |
-		   MAC_MCR_BACKOFF_EN | MAC_MCR_BACKPR_EN | MAC_MCR_FORCE_LINK;
-
-	/* Only update control register when needed! */
-	if (mcr_new != mcr_cur)
-		mtk_w32(mac->hw, mcr_new, MTK_MAC_MCR(mac->id));
-
 	return;
 
 err_phy:
@@ -430,6 +420,26 @@ static void mtk_mac_config(struct phylink_config *config, unsigned int mode,
 		mac->id, phy_modes(state->interface), err);
 }
 
+static int mtk_mac_finish(struct phylink_config *config, unsigned int mode,
+			  phy_interface_t interface)
+{
+	struct mtk_mac *mac = container_of(config, struct mtk_mac,
+					   phylink_config);
+	u32 mcr_cur, mcr_new;
+
+	/* Setup gmac */
+	mcr_cur = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id));
+	mcr_new = mcr_cur;
+	mcr_new |= MAC_MCR_IPG_CFG | MAC_MCR_FORCE_MODE |
+		   MAC_MCR_BACKOFF_EN | MAC_MCR_BACKPR_EN | MAC_MCR_FORCE_LINK;
+
+	/* Only update control register when needed! */
+	if (mcr_new != mcr_cur)
+		mtk_w32(mac->hw, mcr_new, MTK_MAC_MCR(mac->id));
+
+	return 0;
+}
+
 static void mtk_mac_pcs_get_state(struct phylink_config *config,
 				  struct phylink_link_state *state)
 {
@@ -534,6 +544,7 @@ static const struct phylink_mac_ops mtk_phylink_ops = {
 	.mac_pcs_get_state = mtk_mac_pcs_get_state,
 	.mac_an_restart = mtk_mac_an_restart,
 	.mac_config = mtk_mac_config,
+	.mac_finish = mtk_mac_finish,
 	.mac_link_down = mtk_mac_link_down,
 	.mac_link_up = mtk_mac_link_up,
 };
-- 
2.30.2